Mechanical behavior of an as-forged austenite-based low-density steel under high-speed impact loading at cryogenic temperature
WANG Ping1, HUANG Hua-qin1, LI Xiang2, XIE Qian1, HOU Qing-yu1, HUANG Zhen-yi1
1. School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243032, Anhui, China; 2. Department of Science and Quality Control, Nanjing Iron and Steel Co., Ltd., Nanjing 211500, Jiangsu, China
Abstract：In order to evaluate the ability of the as-forged austenite-based low-density steel to resist high-speed impact loading at low temperature,a low-temperature and high-speed impact test using a Split Hopkinson Pressure Bar (SHPB) apparatus at -50 ℃ and engineering strain rate of about 4 300 s-1 was carried out on an as-forged austenite-based low-density steel sample of Fe-28.13Mn-10.04Al-1.05C (Mn28Al10) with dimensions of ø3.94 mm×2.88 mm. The mechanical behavior of the steel at low-temperature and high-speed impact loading was studied. The result showed that,the impacted sample experienced elastic deformation of about 18 μs,compression plastic deformation of about 110 μs,tensile plastic deformation of about 20 μs and fracture under the above-mentioned experimental process. The plastic energy and the adiabatic temperature rise of the impacted sample before fracture were about 1 558 J/cm3 and 178 ℃,respectively. The stress-strain curve of the impacted sample showing a typical strain-strengthening characteristic,and the existence of adiabatic temperature rise made the stress-strain curve showed fluctuation phenomenon. The impacted sample was broken down into three fragments,which were induced mainly by compression plastic deformation and tensile plastic deformation. The fracture showed compression zone and tensile zone,both of which belong to ductile fracture characterized by the dimple. The substructures of the deformation zone near the compression zone and the tensile zone were all high-density movable dislocations. The dislocation density of the compression deformation zone is lower than that of the tension deformation zone,and the length and width of the high-density dislocation in the compression deformation zone were larger than that in the tension deformation zone. The deformation mechanism of the as-forged austenite-based low-density steel of Mn28Al10 at -50 ℃ and engineering strain rate of about 4 300 s-1 was dislocation slip.
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2021, Vol. 56 
